Patents by Inventor Katsuya Ohyama

Katsuya Ohyama has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 6419467
    Abstract: In the suction valve structure of the piston type compressor of the present invention, the primary suction valve 38 is a flexible deforming valve composed of a deforming section 381, which is supported and bent by a cantilever method, and a closing section 382 which connects with a forward end of the deforming section 381 and closes the primary suction port 21. The auxiliary suction valve 39 is a flexible deforming valve composed of a deforming section 391, which is supported-and bent by a cantilever method, and a closing section 392 which connects with a forward end of the deforming section 391 and closes the auxiliary suction port 22. In the present invention, the length of the deforming section 381 of the primary suction valve 38 is approximately the same as that of the deforming section 391 of the auxiliary suction valve 39, however, the width of the deforming section 381 of the primary suction valve 38 is made larger than that of the deforming section 391 of the auxiliary suction valve 39.
    Type: Grant
    Filed: May 16, 2000
    Date of Patent: July 16, 2002
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Muneharu Murase, Atsuyuki Morishita, Masakazu Murase, Katsuya Ohyama, Masahiro Kawaguchi
  • Patent number: 6318971
    Abstract: In a variable displacement compressor that draws, compresses, and discharges refrigerant gas, the displacement is adjusted by varying the inclination of a cam plate in accordance with the difference between the pressure in a crank chamber and the pressure in cylinder bores. A pressurizing passage connects the crank chamber to a discharge passage. A bleed passage connects the crank chamber to a suction chamber. A displacement control valve is externally controlled and varies the pressure in the crank chamber by adjusting the opening size of either the pressurizing passage or the bleed passage. A suction control valve closes a duct between the suction chamber and an evaporator when the pressure in the crank chamber exceeds a predetermined level to prevent an excessively high pressure in the crank chamber.
    Type: Grant
    Filed: March 14, 2000
    Date of Patent: November 20, 2001
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Masaki Ota, Muneharu Murase, Tetsuhiko Fukanuma, Katsuya Ohyama
  • Patent number: 5765996
    Abstract: A compressor has a plurality of cylinder bores defined around a rotary shaft in a cylinder block and a plurality of double-headed pistons accommodated in the respective cylinder bores. The pistons compress refrigerant gas in a plurality of front and rear compression chambers defined in the bores in the front and rear of the respective pistons according to the rotation of a cam plate mounted on the rotary shaft. The compressor has bearing that receive thrust loads applied to the rotary shaft during operation of the compressor. The pistons create a net thrust load determined by the difference between the maximum of the sum of loads applied to the front sides of the pistons by the refrigerant gas in the front compression chambers and the maximum of the sum of loads applied to the rear sides of the pistons by the refrigerant gas in the rear compression chambers. The pistons transfer the net thrust load to the rotary shaft in a predetermined direction.
    Type: Grant
    Filed: April 3, 1995
    Date of Patent: June 16, 1998
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Toshiro Fujii, Koichi Ito, Kazuaki Iwama, Katsuya Ohyama
  • Patent number: 5638736
    Abstract: A wave cam 17 is rotatably supported by a drive shaft 13 in cylinder blocks 11, 12. Front and rear cam surfaces 17A, 17B of the wave cam 17 are defined by the surface of a predetermined imaginary cylindroid. Semi-spherical shoes 18, 19 are interposed between each cam surface 17A, 17B and each double-headed piston 16, which is accommodated in each cylinder bore 11a, 12a. Each shoe 18, 19 has a spherical surface 18a, 19a and a flat surface 18b, 19b. An imaginary circumference C0 corresponding to the arrangement of centers Q1, Q2 of the spherical surfaces 18a, 19a of the shoes 18, 19, respectively, is defined on each cam surface 17A, 17B. An imaginary circumference C1 corresponding to the arrangement of axes L1 of each cylinder bore 11a, 12a is also defined on each cam surface 17A, 17B. The center of both circumferences C0, C1 coincide with an axis L0 of the drive shaft 13. The radius R1 of the circumference C0 is larger than the radius of the circumference C1.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: June 17, 1997
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Kazuo Murakami, Toshiro Fujii, Kazuaki Iwama, Katsuya Ohyama
  • Patent number: 5551844
    Abstract: A reciprocating compressor includes double headed pistons forming front and rear sets of compression chambers on either side thereof and a pair of tapered rotary valves arranged for introducing a coolant gas into the compression chambers. The valves are urged into contact with valve chambers by springs and a drive shaft is urged in one axial direction by a prestress mechanism. The valve urging force for one rotary valve is different from the valve urging force for the other rotary valve, so that the rotary valves operate at different times and over different distances and the movements of the rotary valves are controlled to move the drive shaft in the same axial direction as the direction of the prestress mechanism.
    Type: Grant
    Filed: July 3, 1995
    Date of Patent: September 3, 1996
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Toshiro Fujii, Yuichi Kato, Kazuaki Iwama, Katsuya Ohyama
  • Patent number: 5542340
    Abstract: A wave cam type compressor includes cylinder blocks. A drive shaft is rotatably supported in the center cylinder blocks. A plurality of cylinder bores are defined about the drive shaft in the cylinder blocks. A wave cam, mounted on the drive shaft, comprises opposing cam surfaces. A width of second portions which move a piston to its bottom dead center position is more narrow than a width of first portions which move a piston to its top dead center position. The pistons are connected to the wave cam by way of shoes. The shoes move along a predetermined path on the cam surfaces. The shoes and the wave cam convert the integral rotation of the drive shaft and wave cam to a reciprocating movement of the pistons to compress fluid introduced into the cylinder bores.
    Type: Grant
    Filed: October 4, 1995
    Date of Patent: August 6, 1996
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Kazuo Murakami, Toshiro Fujii, Kazuaki Iwama, Katsuya Ohyama
  • Patent number: 5536149
    Abstract: A piston-reciprocating type compressor has a disk mounted on a rotary drive shaft and operably coupled to a piston. The piston compresses refrigerant gas in a cylinder bore with a compressive force according a cooling load. A retaining chamber formed in the vicinity of an end of the drive shaft. A partition is housed in the retaining chamber. Two recesses are formed with the opposite sides of the partition in the moveable manner. The compressed gas is supplied to the recesses under pressure in proportion to the cooling load. A thrust bearing which connects with the partition supports an end of the drive shaft. The drive that is biased in the direction counter to a thrust load acting on the drive shaft.
    Type: Grant
    Filed: July 19, 1994
    Date of Patent: July 16, 1996
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Toshiro Fujii, Koichi Ito, Kazuaki Iwama, Katsuya Ohyama, Yuichi Kato
  • Patent number: 5533872
    Abstract: A rotary valve is supported on a rotary shaft for an integral rotation. The rotary valve has a suction passage and a discharge passage. The suction passage connects a cylinder bore with a suction chamber according to the rotation of the rotary valve when a piston is in the suction stroke. The discharge passage connects the cylinder bore with a discharge chamber according to the rotation of the rotary valve when the piston is in the discharge stroke. The discharge passage includes a first passage and a second passage. The second passage communicates with the cylinder bore after the first passage has communicated with the cylinder bore after the first passage has communicated with the cylinder bore according to the rotation of the rotary valve. A discharge valve is mounted on the rotary valve. The discharge valve selectively opens and closes the first passage according to the difference between the pressures in the cylinder bore and in the discharge chamber.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: July 9, 1996
    Assignee: Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
    Inventors: Toshiro Fujii, Kazuaki Iwama, Yuichi Kato, Katsuya Ohyama